postrm is in kmod 15-0ubuntu7.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh -e
case "$1" in
purge)
rm -f /etc/modules
;;
esac
exit 0
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